International Organization for Standardization
Arc Welding and Cutting — Nonconsumable Tungsten Electrodes — Classification
ISO 6848:2015
Introduction to ISO 6848:2015 Arc Welding and Cutting — Nonconsumable Tungsten Electrodes — Classification Standard
Standard Number: ISO 6848:2015
Standard Name: Arc Welding and Cutting — Nonconsumable Tungsten Electrodes — Classification
Chinese Name: 電弧焊和切割 — 非熔化鎢電極 — 分類
Issuing Organization: International Organization for Standardization (ISO)
Publication Date: May 2015
ISO 6848:2015 is the tungsten electrode classification standard issued by ISO and is widely adopted throughout the international welding industry. This summary has been compiled by CTIA GROUP based on publicly available information. For the complete official standard, please obtain the document through authorized channels.
1. Scope
This standard specifies requirements for classification of nonconsumable tungsten electrodes used in gas tungsten arc welding, plasma arc welding, cutting processes, and thermal spraying.
2. Classification
The standard classifies tungsten electrodes according to the type and content of oxide additives. Major grades include WP (pure tungsten), WT series (thoriated tungsten), WC20 (ceriated tungsten), WL series (lanthanated tungsten), WZ8 (zirconiated tungsten), and WY20 (yttriated tungsten). A unified color coding system is used for identification.
3. Technical Requirements
3.1 Chemical Composition
The standard specifies the oxide content range and allowable deviation for each tungsten electrode grade. For example, the thorium oxide content of WT20 shall be controlled within 1.8%–2.2% to ensure stable welding performance.
3.2 Dimensions and Tolerances
The standard covers common sizes ranging from 0.25 mm to 10.0 mm in diameter. Standard lengths are typically 150 mm and 175 mm. Requirements are specified for diameter tolerance, length tolerance, and straightness.
3.3 Surface Quality
The surface of tungsten electrodes shall be smooth and free from cracks, delamination, burrs, or other defects that may affect performance.
3.4 Color Coding
The standard specifies a unified color code for each grade. For example, WP is green, WT20 is red, WC20 is gray, WL20 is blue, and WZ8 is white.
4. Marking and Packaging
Product packaging shall indicate the standard number, grade, dimensions, weight, production batch number, and manufacturer information. Appropriate packaging shall be used to prevent damage or contamination during transportation and storage.
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